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Full text of "The Flow Of Gases In Furnaces"

DESIGN OF OPEN-HEARTH  FURNACES

281


	Gas on Gas
	Air on Air
	Gas on Waste Gas
	Air on
 Waste Gas

Pressures required for impressing velocity and velocity changes upon flowing gases in kg per m2 or mm of water:  8 = Uptakes ............
	2 199
	1 319
	3 111
	1 254

Cinder pockets ............            ....
	
	
	0 495
	0 543

Necks 0.525-0.498= ............
	
	0 027
	
	

Chamber above checkerwork .........
	0 462
	0 498
	
	

0.657-0.495= ..................
	
	
	0.162
	

Checkerwork ...........            .   .
	0 049
	0 047
	0 072
	0 052

Flues below checkerwork ...........
	
	
	0 916
	0.570

0 590-0 512 =
	0 078
	
	
	

0.460-0.268= ..................
	
	0.192
	
	

Fantails ...............              ....
	0 512
	0 268
	
	


	
	
	
	

8 total between valves and ports, kg per m2 or nun of water. . .        .              .   .
	3 300
	2 351
	4 756
	2 419

The friction losses = 7 in kg per in2 between the valves and the ports are: Uptakes    .............              .   .
	0 360
	0 300
	0 411
	0 274

Cinder pockets
	0 129
	0 144
	0 147
	0 144

Necks
	0 129
	0 144
	0 147
	0 144

Chamber above checkerwork
	0 048
	0 048
	0 055
	0 043

Checkerwork ...................
	1 802
	1 987
	2 064
	1 808

Flues below checkerwork ............
	0.553
	0 548
	0 632
	0 554

Fantaiis .............................
	0.320
	0 383
	0.338
	0 359


	
	
	
	

7 total between valves and ports, kg per m2 or mm of water ...................
	3 341
	3 554
	3 794
	3 326

Valve resistance 5 = kg per m2 ............
	4.201
	2 317
	6.216
	4.781

5 = velocity pressures between valves and ports         ..........
	3 300
	2 351
	'4 756
	2 419

7 = friction losses between valves and ports
	3.341
	3.554
	3.794
	3.326

Summation, kg per m2 or mm of water . . Chimney effect of checkerwork, uptakes, etc.
	10.842 12.851
	8.222 10.683
	14.766 13.217
	10.526 12.990

Chimney effect available for port velocity, kg per rn2 or rnm of water
	2 009
	2 461
	
	

Draft   depression   required   at   reversing valves, kg per in2 or rnm of water  ....
	
	
	27.983
	23.516